Add 'laravel.auth: login' and 'laravel.auth: logout' events.

Signed-off-by: crynobone <crynobone@gmail.com>
Update auth test case

Signed-off-by: crynobone <crynobone@gmail.com>
Merge pull request #1485 from laravie/feature/auth-events

Add 'laravel.auth: login' and 'laravel.auth: logout' events.